Altair-the hottest `cool' star in X-rays

Details Altair-the hottest `cool' star in X-rays Altair-the hottest `cool' star in X-rays

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..620r&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Computer Science

Databases

X-Ray Binaries, Chromosphere, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.

Scientific paper

We present first results from a deep (130 ks) XMM-Newton observation of Altair and study the coronal X-ray properties of a late A-type star for the first time in detail. We find that Altair's thin outer convective layer and its fast rotation generate a corona that resembles those of low activity stars of later spectral type. Cool plasma at low density produces weak X-ray emission that shows moderate variability on timescales of hours to days. We find a neon to oxygen abundance ratio of Ne/O ~0.2, similar to other inactive stars and the Sun.

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